SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb990cbdb7d690d49c522f27b4a6b5c8e6c24920642fb1a07e8a93337ca24c30' 
  AND token = 'D7mFm9laACfWYVwMQ6WbKqV/5RilxULPQZvnzyKjAhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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