SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c26bb46ed0cbb91e356306b5405188dab33d71d9dfa3f4563f2da6f65d8b2716' 
  AND token = 'uEENKKhkmp5O9hEVLx9b/0oczcrBTwSFL/4qBzn0CNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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