SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3bf37ab442705d3b7ab8b8a5a67b44796f5a5a0be33c46034e41532e3932c083' 
  AND token = '87Yj/wdSuWJzKHHsKwPiGt/EjKM63H7AIr+KnEJ+pQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}