SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '29ca01cd09420ef63087d658e9610b06b145d9cb13d5385b6507e7a68cddfb66' 
  AND token = 'OLMn8OvxQ2YXKAoBak4+BiaGh9FzZC0DebcG0p/p7+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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