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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '23e5a18ca00c8fb9effb2bf0eb0724c7718396c4ef6c9e4ab04a1635eaa1fb24' 
  AND token = '3q5tq4Hlt+tQPpl1ljAqlbKdlLzVav0a0PXXH6ZaYkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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