SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ff263e96d7833040a40a8f702e7e9dd0962a974c357b1b34ed41b8e402c805d' 
  AND token = 'RNKruWOBnehslMlZFAVB2NBKiJoKwjinTxiHJCeBBkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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