Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Krabi to Qatar as you normally would.
Krabi (KBV) is the airport you will fly out of if you book a flight from Krabi to Qatar. It is only a 8.7 km journey to Krabi (KBV) from Krabi’s city centre.
This is defined as Krabi Airport (KBV) and Doha Hamad Intl Airport (DOH). Codes like Doha Hamad Intl Airport are often used to just call airports uniquely.