SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2ed488d87b5f49c4d639b92edec408bdb3f9fea9c16a824aa7bb5865b77cfc82' 
  AND token = '91UUKY9Gk+lS3LqUUwVouXxakl1/QT7QxOhrJA/DcJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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