SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e7a76b2ada285226e8df5b870d1999bd4c947e34c3144f540ec97103fd7dc07' 
  AND token = 'UUAYGqs52ZDjoaDighV7yNuQSpkNJNP6OCqLr+wwgW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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