SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a977b05168522eff3db67970c5c57f5fa3f63bac7d4995486de40b34818172b' 
  AND token = 'qcuw2VUWHym49sTw/iQbawKORna7QcbijBUMY5WtEf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00392

JSON explain

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