SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c532848994ef1a7a356032b3d33e057488b401b6916abb4c7bcc2b54a4fe5742' 
  AND token = 'fYAwNNjLJevHPCwcJhyJf9r+PABEiTHVrhqA8QaLYlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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