It's an interesting topic and I guess from the initial reaction perhaps a little confusing.
@nina used the wiki definition that kink is per se non-conventional sexual activity. This would seem to automatically preclude all non-sexual behaviour as a kink however when we examine this more closely that's not the case.
If we agree that asexuality is broadly accepted as a sexual orientation, i.e. lack of interest in sex is in fact a recognised sexual orientation then things look somewhat different. However this doesn't make asexuality of itself a kink, in fact it must be recognized simply for what it is, an orientation that some people have.
Following this logic we then arrive at the situation where we have people with no interest in sex still being attracted to kinks that other sexually oriented people enjoy. And so in this context I would say, most certainly yes, asexuals will enjoy the aspects of many kinks that work for them.
As mentioned by both
@nina and
@andrei there are a bunch of things that can fall into this category.
A lot of bondage can be done in non-sexual ways, clothed bondage is in fact quite common, can be both intricate and engaging and most certainly is a kink. There are also many kinds of D/s situations that can be entirely non-sexual based including punishments and/or humiliation aspects such mouth soaping, line writing, corner time and so on. I'd also put a lot of fetish wear in this same category for while it certainly can have sexual uses many enjoy it simply for the way it looks or feels to wear.
Given that I'd suggest it seems obvious that if you're tying someone up be it for sexual purposes or not just about everyone would call that kinky.