SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c8df585ccb4f15aa5a21b3bd7c5219e0ab4d9d20a54b586ae6f8db8a22fc05be' 
  AND token = 'icx9KvOJZuCYGaQKmYoNszo6JhN13MfpHEBqimq0GGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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