Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '21442262c50ff0518077056ce6768a49a5eb6b35924a3bdd93bed8c85e6ca4f4' 
  AND token = 'gA64ea9qhA4q7al9fGjof9cDjddBlk7FoEq5DYtgK+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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