SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1319af701e8360ac7612dec79429ca8fb6e350604c598fada985a51c3de6fabe' 
  AND token = 'Z+TQFK1NGksMRV3Wt0QA7GjNlJWpNgXU5uwADTzdNgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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