SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ade06f871c3b3cf5370848c9435f25ea31485593c16f2b1008d6568b47f42b80' 
  AND token = 'TL6zrkiGWI/BM5UQfmgmFF6EtpTC1tH/ZZoNHThuOFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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