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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a1da60cb5ff839a8ba88858327dec5b62a1a185e5db8411bf7ec3723b5726a9' 
  AND token = 'tvrAjqm0bogjD4F9TfZxnkB+kfgIEaYHxJg0XfCTaZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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