SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e2eb646831119a4a60d0c1fa61d300f8b22e88a3d21c4b6b13d5e4fe50185510' 
  AND token = '+fWchRDBLBI8uqPIgMHQy5rqpLxuwsFJOmLzUcg4fPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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