Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '98370376460de6e21c0586b97b6e0e9c82faa1dbdeb8bf69adc93c0060ba1ac5' 
  AND token = '+jGcxQtCPF6+IDIOfRBDwCIE4obAeGW5fXjXr+Eesws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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