Curried egg salad

1/3 cup mayonnaise
1 tablespoon fresh lime juice
1 1/2 teaspoons curry powder
1 teaspoon Dijon mustard
1/4 teaspoon salt
1/8 teaspoon cayenne
6 hard-boiled large eggs, chopped
1 cup diced (1/4-inch) Granny Smith apple (from 1 apple)
1/3 cup finely chopped red onion
1/4 cup chopped fresh cilantro