SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a6a7fe87167978f70def0e187f859481fd6cc56bf12463227838a9a4a483235' 
  AND token = 'ZNHaV233LyJcV+5/gcAnZV3ENTsB6Qr4yGdRszXmHWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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