SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7192ff310d98b5907e33e9c90ce19a22d10489f548d7a42bf8156799392cd711' 
  AND token = 'drBASZFCU6ihBefnGUBPz4zRHo5kF3ZzvK9soW5hl/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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