MBP got a bit wet – works now

Two days ago a little bit of water spilled onto the right corner of my keyboard. I immediately turned it off and left it to dry. Now I turned it back on and it seems to be working just fine, no problems with the screen or keyboard or anything.

But I'm still worried that something might be broken, maybe not now or soon but in, say, a year. Should I go to an Apple Store and let them check if everything's fine? Will I be charged for that?

Thanks in advance!