Hey Alicia and Welcome !!
Looks like there is a few ways to skin this cat. They make standard 120V plug converters to twist lock. So you plug the pump into the adapter and then plug that into the standard GFCI outlet, or regular outlet with a GFCI breaker. Like this.
This AC WORKS Brand adapter [S515L520-012] is very durable. It is a NEMA 5-15P to NEMA L5-20R. The NEMA 5-15P is a 15 Amp, 125 Volt household straight-blade male plug. The NEMA L5-20R is a 20 Amp, 125
www.homedepot.com
Or you use a GFCI breaker on the circuit and use this outlet with the twist lock pump plug directly into it. Like this :
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There does not appear to be any 120V twist lock GFCI outlets available. Maybe the pump is primarily from another country where they use them ?