it's even worse if he has Ax and is 4b bluffing you
if you shove he has 0% equity because he folds
if you flat and he gets an ace you have no one to blame but yourself

but yeah, stacks makes a good point that seeing a flop and making sure there's no ace doesn't help us because we still have the same equity against his range

also, you have kings and you're not even 200BB deep
you should be aggressive enough preflop so that people want to play for stacks with a wider range against you