SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad24c975822136183996f23d11f08ad276e3aefc8d64dbe601cd2f9cbd414c84' 
  AND token = '+grPgSQr/NWtlfR8QXSHbrhPzVg7/nwAIq1yiVaMlY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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