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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a0c6cb39db0add42e9ee0146d11eb9065f7f181ac4b4b6daad5d54b75aeb028' 
  AND token = 'BbUCAka+ZbcISB3bvghsiyRbIyFNgk90tzFz3+xTMLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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