Bring quinoa, salt, and 1 1/4 cups of water to a boil in a medium saucepan over high heat. Reduce heat to medium-low, cover, and simmer until quinoa is tender, about 10 minutes. Remove from heat and let stand, covered, for 5 minutes. Fluff with fork.
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Meanwhile, whisk lemon juice and garlic in a small bowl. Gradually whisk in olive oil. Season dressing to taste with salt and pepper. Add cucumber, tomatoes, herbs, and scallions to bowl with quinoa, toss to coat. Season to salt and pepper, drizzle remaining dressing over
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Spread out quinoa on a large rimmed baking sheet, let cool. Transfer to a large bowl: mix in 1/4 cup dressing.
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Add cucumber, tomatoes, herbs, and scallions to bowl with quinoa; toss to coat. Season to taste with salt and pepper. Drizzle remaining dressing over salad.
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