SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd403a6ef9aaa546fdbb6dcd8293d03f996e931092ee4f6156665cae75d3f1d1b' 
  AND token = 'oNdfhVCg+5AfutYvkgLyq64k5eZOKDQdL+gJknxQBzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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