SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67852214104c22a743d72856a9425c78bcf7915a09f124adb4d3f15afaa81b68' 
  AND token = 'TdU7BlLYKOrrOJEKdahvnrpQmPEZNOKMslR/+/nINXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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