I'm a member of priority club also.
Do you mean
Priority Pass? If so, you should have access to the AS Board Room, but if you're going to pay money to get you and your family into the club at your level of membership, I'd say buy food in the Central Terminal area if you have the time, nearer your gate if you don't (with 45 minutes it might be hard to wrangle small children fast enough to buy food AND make your flight).
Not only that, this is a eastbound flight
I'll be flying with alaska air to Maui Hawaii with my family. My layover at sea-tac is only 45 minutes.
SEA to OGG is eastbound?

Well, I guess if you have enough fuel...