From What to Expect on Arrival and Leaving Krabi Airport:
Krabi Airport has all the facilities required to travel comfortably: ATM machines, money exchange booths, books and souvenir shops, and a few venues that sell food and drinks
From Shopping & Eating at Krabi Airport:
As a small airport, Krabi doesn't have a lot in the way of shopping or dining opportunities.
Do souvenir shops sell edible insects or other exotic Thailand food/drinks in Krabi airport? What are options to buy before departing? Are prices significantly higher than in a city?