SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '07bfab8e32e85ed7d8cb9caa797a40a57868a639c8255a55c1fc1b56e4ad07f9' 
  AND token = 'YRQutnJFJBZzdguCCuV69+1zwdQCvdhhRGH7ySAfZR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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