SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f62ee23107af1be2d518334621fa217fc0ab961185417273b993b23ad38ec3de' 
  AND token = 'qCtutBYzk5JWHSVOID3QwF3K6D8eWW0Cx1dvmbTJGLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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