[lapoker17]

This is very simple - Will he limp AT or better on the button after a bunch of limpers? If yes, then fine, you can fold if you like. If he would make this raise with A3, then I call and stack him on the turn. If he'll call right now w A3 then push. Not too hard.

If he will make this raise on a paired board with a flush draw, then push too.

Your 40 bet into a pot of 75 right (not 62) is bad unless you were specifically trying to induce this action - in which case you wouldn't be asking us questions about what to do. So bet the pot on the flop.