SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd235f02cd204d3ead140f29f1ef025d6b722696d822d657dc6cea9a2a9494fbb' 
  AND token = 'AqYtz06wZA1lBq9Z8DRYuFtSIIgFsxdoWUGyZr8kjKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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