SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e186809e3b2a29b5f386a8ebc37abcb58871108d8d5e4d61600574b2d55bd1cf' 
  AND token = 'OAPpwVFjY99ifIa7KQn0F3+EInSCvhpWqMkz8s3A1TU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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