SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cda3783b402e24dcf0ccac77fcca5178d7586c15f533cf59915d086dd5648f81' 
  AND token = 'nsN9LvIYjhMhVEqN3PwVb9i3zOSOgc/K9f7nLCHQsU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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