SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '63ff1dfab3b560e9aadb0f2705facd3969615902f1fe63561c843dd7071e3a10' 
  AND token = '9hoIXOhzwhvMB5FApB/mYnI1HmOT4mDqXHYsUs9oSqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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