SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f05469e5ee5389bb7629873e674d571a333d833644b86f2f4ceb4b71a8eded8' 
  AND token = 'E3h/sotJ0JlBkbGe0znvBL4xGCce6GB5XA/eZ/KBN+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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