Lounge access at Marrakech airport

There's one airside paid lounge in Terminal 1, the “Convives de Marque” Lounge. If you have a priority pass, you can get access to the lounge. If you fly a lot with airlines where you don't have status / no such thing as status, then getting a Priority Pass can be a good idea. You can often find trials and discounts for new signups, and there are various financial products (eg high end credit cards, premium bank accounts) which will give you one. You mostly just need to think about how much you'll use it, to decide if you want one with a handful of inclusive lounge visits then pay-per-use after, or an unlimited one. It used to be accessible through the Priority Pass lounge scheme, but they've recently stopped accepting it.

Alternately, it looks like you can book access from the airport's website

(An alternative to Priority Pass which allows you to book lounge visits without a subscription is Lounge Buddy. They don't have the same range of lounges as Priority Pass, and sadly the “Convives de Marque” lounge isn't one of the ones they can currently sell you access to)

Just for info for new readers with the same question:
The priority pass is no longer accepted at the Marrakech airport.