SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6dfdd2dc7361c14c38b3af9e0fe66acf48dc4c5c589632194d4186fb2f4c951e' 
  AND token = 'goO8lq+KyYZNUT0Nu9cwV0vwcaHGhGcYrhhzJY22yzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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