SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c6f93e238539de7e17518f934706fc2a5895001969d3510fd382fec6582979f6' 
  AND token = 'Hd4XGqDG4xeckLqSOAQZ7vgCLQJ7BoPUfJzvypd0NCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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