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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2103a1522ea6353769e1a4eda726a3ffaf6683d3534fe5c328e366ed7d1e8b7' 
  AND token = 'SdgKn4jzAwcSDJdbLolfOkXdqvhv+xb9ECTTyIbopBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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