SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '683d4944b9977a6369c4a9ad69ef8bd8229d4fe87b0eb99ae66ca25356b83d1b' 
  AND token = 'zxS3sB1H3BJpfvJllk7tDUI9Gmck7/TWqsCYPRQxEjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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