Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ac98cf66ddda13fa3dd5cc49bef552e9472e96eeac69b119c8618a1932ea4fb' 
  AND token = 'cLLUQATl3xRu0UOON5kQ4HiJ4y91beeXaAxf/1V411M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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