SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd15920674290daaec8fbe93fb42400e6c99b1a63f8c1d169e34647a7a4febc2' 
  AND token = 'Nq9ejrinjhl70COOLvqKsxKVTXT+9fubZVwdd2PWIR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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