SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6481f975a45683b62da028c173fbe6ef2c19762dc2359bc37ecbca78ebc42c40' 
  AND token = 'msAlFuzLU/wQAPQR9FKyTYXAJx5GEkenWnZPX2tdfZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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