SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9536da8581aaf6c2da79810cb325c0cd175b81a159b47cb0c91543f75d1a0f22' 
  AND token = 'VkHgvJSS8Er9bUKFit6utWegQXqL1vrTghz//ATMwmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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