SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7bd3b7a81217bf2b672a2569d4ff1a2f533c2d882f2300bed43a2824027e618c' 
  AND token = 'oZYvBFSBPVMIvYyDnEpCQJZd4vUUumbefFgmejXHK2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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