SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6321b46f22faa592da332d4d1f2e0615479077b03c8c1741a7fc592f9c532ae5' 
  AND token = 'GqAzQKzfXgm3FCO8LkkMMq+KmbhLc9aax+9Mj48wbBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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