Boil water in a small saucepamn, remove from heat and add couscous. Cover; let stand 5 minutes. Uncover and cool 10 minutes at room temperature.
Combine oil, lemon juice, curry powder, garlic salt, and crushed red pepper in a small bowl. Stir well and let stand 10 minutes. Combine vegetables, beans, and couscous in a large bowl. Pour dressing over salad, toss to coat. Cover; refrigerate 1 hour to blend flavors.