SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26f54f9d645443bd39729917baf9fc3731ee0a2762a7e4865513447def90e139' 
  AND token = 'gbovkfv5RzNSN95Gbqi/k6uVJpT7XZGqXOnze++V01I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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