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If you want to mimic what the old Ultimatte boxes used in television used to do, you can use Apply Image and use 

SG-MAX(SR,SB)

as an expression for each red, green and blue (set alpha to 1 or simply leave it at sa). That's going to give you a grayscale mask. Clean that up with Levels, Invert, and then go Layer > Rasterize to Mask.

 

You can save that as a macro and it's as close as it gets to a one click solution.

 

An alternative approach that is also quite quick is to use is Select > Select Sampled Color. Can't test how well it works with green screen material right now, though, since I can't use selections due to this annoying bug, but it should work pretty well until Affinity gets a real HSL keyer.

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An indirect way to achieve this if you really need to right now might be with a third party Photoshop compatible keying plugin like Primatte for Photoshop or maybe you can find an old copy of Ultimatte AdvantEdge for cheap. But I don't think the Photoshop versions have seen much development recently, and there is currently no OpenFX plugin support in Affinity yet.

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