Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '975ea4af35149425753514890644973dea134b7bc5f1c36f78d44bf0d325331c' 
  AND token = 'lg4sZY47B9q7D/9+IYlfn3+0hMB8simOeGdfdptdwcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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