SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2896c281e3f06efe90dd3e3a2c5152062e2cca6a1b3ee6404b8b127f6e2b03a2' 
  AND token = 'ogPjYPXqAKAVOAmJY+Me9WXo4/bCFK1g9VtxCw5PQ0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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