Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5fe36f4599b49e41131826f1c04b1ecb10572b4f0d0bad9fb2fc8dee3610916c' 
  AND token = 'QN5+NHZ5V9YkF2rr+ws/x5OtMq5MDxCfiIjsbY65wfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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