SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2bd5a573a6153f88308bf8f43ddffc37323536323bf4a4d0a4595cc22cf7c895' 
  AND token = 'LyxPGtZRWD7r2fhJfvkVY1KRcLAV9QwMAJIA/Hi15Zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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